Pulley



Oct. 9, 1928. 1,687,442

` F. .1. HARDLEY PULLEY Filed Oct. 25, 1926 'Mall /a 32 3v l Frank L Har' 1| Patented ct. 9, 1928.`

v'UNITEDjs'rfras FRANK J. Hamam-ix, or Los ANGELES, CALIFORNIA'.

` PULLEY.

Application led October 25, 1926. Serial No. 144,103.

The present invention relates to pulleys, and more specifically to that type commonly known as split pulleys.y v Y The primary object of the invention is to provide an improved type of spilt pulley which may be readily secured in position at i any desired point along a shaft without the l necessity of providing a key and key-way for locking the pulley to the shaft, and without requiring the shaft to be removed for lplacing of the pulley.

A further object ofthe invention resides in the provision of Va split pulley embodying means for automatically clamping the pulley to the shaft whenv the pull of the belt or other drive means acts upon the pulley in one direction for causing the shaft and pul-l ley to rotate as a unit, and which clamping means upon pull of the belt or other drive means inthe opposite direction, automatically releases the pulley from the shaft for allowing the shaft and pulley to rotate in-y dependently of one another. 1

A` further object of the invention resides in the provision of an improved type of keyless split pulley vembodying roller means for binding the pulley onto the shaft when acted upon in one direction by the belt or other drive means, with the rollers so arranged that an even binding action isl created uponl the shaft longitudinally thereof throughout a substantiallength of theV pulley and thus Y prevents any possible vtorsional strain upon the pulley which might tend to cause the pulley to run eccentrically upon the shaft.

A still further object of the invention is to provide a spilt pulley embodying roller f clutch means arranged at the bore of the pulley, with retaining means provided for the rollers of the clutchmeans whereby the rollers will be held in positionduringassembling of the pulley upon the shaft.

Other objects and advantages of the invention, will be apparent during the course of the following detailed description, taken in connection with kthe accompanying drawing forming a part of this application and in which drawing:

Figure 1 is a longitudinal section through a pulley constructed in accordance with my invention, the same being taken substantially along the line 1-1 of Figure 2 and showing the thrust or clamp collars for preventing lateral ymovement ofthe pulley on the shaft.

Figure 2 1s a transverse sectlon on line 2-2 of Figure l and looking in the direction y of the arrows.

Figure 3 is a sectional view on line 3 3 ofy Figure 2 and showing portions broken away forV illustrating certain .details of construction.. i

J Figure'4 is Ian enlarged fragmentarysection on line 4-4 ofy Figure 1 andshowing the manner in which the rollers are Yretained in position when the pulley sections are disi of cast iron and be of any desired diameter,

comprises a pair of similarlyformed semicircular sections or halves 10 and 11 pref-` r erably provided at their ends with flangesA 12 which terminate flush with the flat confrontingnfaces 13 of t-he'sections. Formed integral with each'end lof each of the sections 10 and 11, are extensions or ears 14 preferably of a length equal to the diameter of the pulley, and which extensions or ears are adapted to vreceive yclamping bolts 15l arranged one at each side of the shaft B, and which clampingl bolts and extensions 14 serve for retaining the pulley sections 10 and 11 in assembled position upon the shaft.

.Provided in each of the sections 10 and 11, and extending longitudinally at the flat confronting faces 13, thereof, are semi-circular of theshaft B, andy which grooves when the sections are in assembled relatiomform a longitudinally extending bore through which the shaft B extends. It is preferred that when the sections 10 and 11'are clamped in position upon theshaft B, that the confronting faces 13 thereof be slightly spaced apart as illustrated in Figures-1 and 2.

Provided in each of the sections l0 and 11,

' shaped grooves 16 of a radius equa-l to that Y and extending longitudinally of the sections ing cani channels are divided or spaced by a rib 20, and do not extend to the flat con fronting faces 13 of the sections but are closed along their longitudinal sides by webs 21. By again observing Figures 2 and Ll, it will be seen that the carn surfaces, or faces 19 recede in a clockwise direction fioin the surface of the shaft B, and in the exaniplc shown are of greater radius than that of the shaft E and struck freni a center eccentric to the axis of the shaft for causing the channels 18 to be of greater depth at one side or edgeV than at the opposite side or edge. 'llhe cain surfaces 19 all recede froin the shaft surface in a like direction circninferentially of the shaft. The inner edges of the ribs 2O and webs 21 contact with the surface of the shaft B and forin continuations of the seinicircular shaped grooves l@ so that the sections l() and 11 have contact with the shaft throughout their lengths.

Disposed in each of the longitudinally extending channels 18, is a gripping roller 22 having reduced end rportions 23 providing shoulders 2dadjacent each end of the rollers. These rollers 22 are of a length slightly less than that of the channels 18, and of a dianieterf greater than that of the depth of the channels at their shallow sides or enges.

Vlhen a belt or other drive ineans is trained over the pulley A andk acts in a direction as indicated by the arrow in Figure 2, the rollers 22 will be caused to niove toward the shallow side of the channels and be wedged between the cain faces 19 of the channels 18 and the shaft surface in a manner'for coupling the pulley to the shaft so that the pulley and shaft will rotate in one direction as a unit. When the belt or other drive means acts in a direction counter to that as indicated by the arrow in Figure 2,

'the rollers 22 will niove to the deeper side or edge of the channels 18 and thus prevent movement of the pulley A being imparted to the shaft B.

lt niay herey be well to state that the clamping bolts 15 are not tightened to a degree `whereby the pulley sections will be clamped tight upon the shaft B, but that the bolts 15 are only tightened sufliciently for allowing the pulley to rotate freely upon the shaft. lt will be seen that the semicircular shaped grooves 16 provided at each end of the sections, forni bearings for the pulley sections. o

Arranged at each end `of the channels 1S iii each of the sections 10 and 11, and extending across tlie end portions of the channels, are half circular springs 25 preferably 'held in position by ineans of screws 26 threaded into the ribs 20. These screws 26 are preferably provided with counter sunk heads which llie flush with the inner faces ofthe springs 25, for presenting a sinooth inner surface to the springs rlhe springs rear/,alia

and act as abiitinents for limiting latt-iralV shifting of the rollers.y `The reduced end portions 23 of the rollers 22 do not contact with the springs 25 owing to the fact that vthe shoulders 24 are of greater depth than the thickness of the springs, Yand thuspermit the body portions of the rollers to be wedged between the cani faces 19 and the surface of the shaft B.

Referring now to the retaining ineans C, and which is intended for preventing lateral inoveinent of the pulley A on the shaft B, the

saine embodies a pair of clamp bloclrs 30 and 31 adapted to be clamped vabout the shaft B as; by ineans of clamping bolts 32, at each end oi the extensions or ears 14. These clamping blocks 8O and 31 serve as thrust collars against which the ends of the pulley A inay rotate, and provide ineans whereby the pnl- `ey inay be positioned at any desired location along the shaft B.

From the foregoing description be apparent that an iinproved and efficient type of split pulley has been provided whereby the pulley may be readily positioned upon a shaft at any desired location without iii-st requiring the shaft to be removed from it will Y ineans for binding the pulley onto the shaft when lthe pulley is acted upon in one direction by a belt or other drive means, and which roller nieanscreates a binding action i;lironghoiit the greater portion of the length of the pulley and insures Va good gripping action `upon the shaft. Y

Changes in detail may be inade to the specific forni of the invention herein shown and described, without departing froin the the scope of the spirit of the invention or following claims.

l claiin:v

1. A pulley 'comprising longitudinally divided sections, having bearing formingA eX- tensions provided at each end thereof, bolts passing through the extensions of the coinpanion sections for securing the sections in assembled relation about ashaft, gripping rollers arranged longitudinally of each pulley section for binding engagement Vwith the shaft. when the pulley is acted upon yiii one direction, said gripping rollers having their ends terminating inwardly of the extensions of the pulley sections, and nieans cari-ed by each pulley section for retaining .the re- Vspective rollers thereof against displacement when the sections are in non-assembled relation. Y

2. A pulley comprising longitudinally d1- vided sections provided at their confronting fronting relation with the surface of the shaft, gripping rollers loosely disposed in each longitud extending channel and movable circunferentially of the pulley to" be wedged between the cam surfaces ofthe channel and the shaft surface when the pulley is acted upon 1n onepdirection, and a retainirnr member carried by each end ofV each pulley section for retaining the rollers in their respective channels upon separation of the pulley sections.

3. A pulley comprising longitudinally divided sections each being provided with longitudinally c-:Xtendino` channels terminating short of the ends of the sections and provided with cam surfaces, means for securing the sections in assembled relation about a shaft with the cam surfaces in confronting relation with the Vshaft surface, gripping rollers disposed in each channel and having reduced end portions, and retaining ineinberscarried by each section and overlying the terminal portions of the channels atthe reduced end taining the rollers in position in their channels when the pulley sections are separated.

fr. A pulley comprising in combination, a pair of semicircular sections having` aligning semicircular shaped grooves provided at each end thereof and at the confronting faces of the sections, said sections l-being provided between the semi-circular grooves with longitudinally extending` independent portions of the rollers for rel channels having cam surfaces, means for se.

curing the sections in assembled relation yabout a shaft with the semi-circular grooves rotatably engaging the shaft, gripping rollersarranged in each ofthe channels for wedging engagement between 'the cam Surfaces of the channels and the shaft surface when the pulley is acted upon in one direction, half circular springs carried by each pulley section and extending across the ends` ofthe channels for retaining the rollers in the channels when the sections are separated, and thrust collars adapted to'be clamped about the shaft at each end of the pulley for preventing lateral movement of the pulley on the shaft.

5. A pulley comprising in combination a pair of semi-circular sections, having extensions provided at each end thereof, said sections each being provided with longitudinally extending channels terminating inwardly of the ends of the sections and provided with cam surfaces whereby the channels are of greater depth at one side than at the opposite side, clamping bolts passing through the extensions of the sections for securing the ksections in assembled relation and rotatable upon a shaft, gripping rollers arranged in each channel for wedging relation between the cam surfaces of Athe channels and the shaft surface whenV the pulley is acted upon in one direction, means carried by each section and extending across the ends of the channels for retaining the rollers within their respective channels, and means adapted lfor clamping engagement with the siaft at each end of the pulley for preventing lateral movement of the pulley on the shaft.

FRANK J. HARDLEY. 

